High availability database

 

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For high availability application servers need continuous access to databases for processing client requests. If your databases reside on iSeries servers, then you can use either of these options to achieve higher availability for those databases:

• Data replication
  

  Data replication uses iSeries clustering, remote journaling, and third-party data replication software to maintain two physically separated copies of application data. Data replication can provide disaster recovery capabilities for the databases because the systems in the iSeries cluster can be geographically separated.

• Switchable disk
  

  Switchable disk uses iSeries clustering, local journaling, and Independent ASP to ensure the availability of application data. You must have OS/400 V5R2 or later installed on the database systems to take advantage of switchable disk technologies involving database collections.

 

Other HA topics

To save a copy of the licensed code and the contents of auxilliary storage to tape, run the SAVSTG command.

To save a copy of each changed object or group of objects located in the same library, run the SAVCHGOBJ command.